(To try and jumpstart some discussion on this community, I figured I'd try reading through the manga (already binged the anime a week ago) and making as bad a summary as I can for each chapter.)

A minor is hurt by an oncoming vehicle, and is offered "something nice" to not die by a woman seeking to use him for her own ends. Now trapped by her contract, the minor (Kazuma) is forced into the lowest rung of a contact company and the woman (Aqua) is eaten alive. A recent school graduate (Megumin) joins him when he offers to feed her, and works her until she collapses from exhaustion.